dashenc: increase buffer time hint in the manifest

to avoid rebuffering on the clientside for difficult network conditions.
Signed-off-by: Anton Schubert <ischluff@mailbox.org>
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/dashenc.c

@@ -481,7 +481,7 @@ static int write_manifest(AVFormatContext *s, int final)
         }
     }
     avio_printf(out, "\tminBufferTime=\"");
-    write_time(out, c->last_duration);
+    write_time(out, c->last_duration * 2);
     avio_printf(out, "\">\n");
     avio_printf(out, "\t<ProgramInformation>\n");
     if (title) {